Abstract
We investigate various connections between the notions of filter, ideal, grill and primal in topological spaces, then we characterize Hausdorff spaces, compact spaces and continuity of functions via limit points and cluster points of grills and primals. As a conclusion on our study on maximal primals, we provide a new proof of Tychonoff theorem.
Cuvinte cheie
Zorn's lemma
primal
ultraprimal
grill
ultragrill